Consumers Union, an advocacy group connected to Consumer Reports, said the market sells meat from healthy animals that are overtreated with antibiotics. They believe this practice makes the medications less able to treat disease in cases where it is really needed, the Tampa Bay Times said. In a full-page advertisement in the Times, the group asked consumers to contact Trader Joe’s and urge the store to stop the practice.

Trader Joe’s has a unique ability to control its supply chain since 80 percent of its products are “private label” meaning the retailer can pressure its meat suppliers to change behavior, the Times said. Last month, Chick-fil-A said it would stop selling chicken raised on antibiotics within five years. Whole Foods, Chipotle and Panera Bread have taken steps to eliminate antibiotics from their meat.